Investigators have not said how the women knew each other or why they may have been targeted.

According to court records, police have identified a man who "at a minimum" witnessed the killings at the apartment. That man, who has not been charged or arrested in the quadruple homicide, is being held on unrelated charges in the Tulsa County jail.

A judge increased bond for the man from $11,000 to $250,000.

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